焊接复合箍筋钢筋混凝土短柱抗震性能试验研究

发布时间：2018-05-27 18:08

本文选题：焊接复合箍筋钢筋混凝土短柱 + 抗震性能　；参考：《西安建筑科技大学》2013年硕士论文

【摘要】：钢筋混凝土结构作为一种传统的结构类型，其应用已经十分广泛，对混凝土起约束作用的箍筋多采用带弯钩的双肢箍或复合箍，传统复合箍筋需要在施工现场加工，工序多而费时；另外对于有抗震设防要求的结构，其箍筋弯钩直段长度要满足10d的规定，同时由于复合箍筋重叠部分多，这都将造成不必要的钢筋浪费；在箍筋体积配箍率较大的情况下，较多的弯钩也将给混凝土施工振捣带来很多麻烦等等，而焊接复合箍筋在很大程度上解决了上述传统复合箍筋的种种缺点，焊接复合箍筋不仅可以产业化生产，而且在节约钢筋用量和加快施工速度上具有很大的优势。本文以焊接复合箍筋钢筋混凝土短柱的抗震受力性能研究为目标，重点展开了以下几个方面的研究：（1）分别对4个内含电阻点焊十字形钢筋以及2个内含带有传统弯钩钢筋的混凝土立方体试块进行拉拔试验以研究焊点受力性能并与传统弯钩锚固强度进行对比；（2）对5个箍筋采用全电阻点焊焊接的复合箍筋钢筋混凝土短柱和3个采用传统带弯钩的复合箍筋钢筋混凝土短柱进行拟静力加载试验并进行抗震受力性能对比。通过试块的拉拔试验得出钢筋焊接后的焊点强度能够满足锚固受力要求。然后对8个钢筋混凝土短柱的破坏形态、滞回曲线、骨架曲线、位移延性、耗能能力、刚度退化和强度衰减等影响抗震性能的重要方面进行了综合分析，重点研究了剪跨比、体积配箍率和轴压比对焊接复合箍筋钢筋混凝土短柱抗震性能的影响规律。结果表明，随着剪跨比的增大、配箍率的提高和轴压比的减小，焊接复合箍筋钢筋混凝土短柱的耗能能力和延性等抗震性能变好；焊接复合箍筋钢筋混凝土短柱相比于传统复合箍筋钢筋混凝土短柱，其抗震受力性能各项指标基本一致，但是焊接复合箍筋钢筋混凝土短柱的抗剪承载力却明显高于普通短柱。本文最后在试验研究的基础上基于修正压力场理论并考虑剪压区和纵筋销栓力对抗剪的贡献提出了焊接复合箍筋钢筋混凝土短柱抗剪承载能力理论计算公式，理论计算值与试验结果符合较好；然后分析了轴压比、配箍率和剪跨比对焊接复合箍筋钢筋混凝土短柱抗剪承载力的影响，利用试验数据建立了焊接复合箍筋钢筋混凝土短柱实用抗剪承载力计算公式，，结果与试验值对比吻合较好,可用于工程设计参考。
[Abstract]:As a traditional structure type, the application of reinforced concrete structure has been widely used. The hoop and compound hoop with crooked hook are mostly used to restrain the concrete. The traditional compound stirrup needs to be processed in the construction site and the working procedure is time-consuming. In addition, the structure with the requirement of anti earthquake fortification, the length of the hoop hook straight segment length To meet the requirements of 10d, at the same time, because of the overlapping of the compound stirrup, this will cause unnecessary waste of steel. In the case of large stirrup ratio, more bending hooks will bring a lot of trouble to the concrete construction vibration, and the welding compound stirrup can solve the various kinds of traditional compound stirrup to a great extent. Disadvantages: the welded composite hoop can not only be industrialized, but also has great advantages in saving the amount of steel and speeding up construction.
In this paper, the research on the seismic behavior of reinforced concrete short columns with welded composite stirrup is focused on the following aspects: (1) 4 inner resistance spot welding tending steel bars and 2 concrete cube specimens with conventional crooked bars are carried out to study the mechanical properties of the solder joints. The traditional anchorage strength of the crooked hook is compared. (2) the pseudo static loading test of 5 stirrup reinforced concrete reinforced concrete columns with full resistance spot welding and 3 reinforced concrete short columns with traditional crooked hook is carried out and the seismic stress performance is compared.
Through the drawing test of the test block, it is concluded that the strength of the solder joints after the welding can meet the requirement of the anchorage force. Then, the damage form of the 8 reinforced concrete short columns, the hysteretic curve, the skeleton curve, the displacement ductility, the energy dissipation capacity, the stiffness degradation and the strength attenuation are analyzed comprehensively. The effect of span ratio, hoop ratio and axial compression ratio on the aseismic behavior of reinforced concrete short columns with welded composite stirrup shows that with the increase of the shear span ratio, the increase of the stirrup ratio and the reduction of axial compression ratio, the energy dissipation capacity and the ductility of the reinforced concrete short columns of the welded composite stirrups are better, and the concrete reinforced concrete stirrups are coagulating. Compared with the traditional reinforced concrete short columns with composite stirrups, the seismic behavior of the short columns is basically the same, but the shear capacity of the reinforced concrete short columns with welded composite stirrup is obviously higher than that of the ordinary short columns.
Based on the theory of modified pressure field and the contribution of the shear pressure field theory and the contribution of the longitudinal stiffened pin force, the theoretical calculation formula of the shear bearing capacity of the reinforced concrete short column with welded compound stirrup is presented at the end of this paper. The theoretical calculation is in good agreement with the experimental results; however, the axial compression ratio, the stirrup ratio and the shear span ratio are analyzed. The effect of the shear bearing capacity of reinforced concrete short columns with welded compound stirrups is studied. The practical formula of shear bearing capacity of reinforced concrete short columns with welded compound stirrups is established by using the test data. The results are in good agreement with the test values, and can be used for engineering design reference.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU375.3;TU352.11

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